Make the Office canvas mount passive so Xpra starts only when the Desktop surface is opened or an official Office document is created/opened.
Track Desktop host visibility to unload hidden frames, stop monitors, dedupe viewport resize work, and set Xpra offscreen mode according to HTTPS support. Add a near-future note for the tunnel memory footprint.
Show Office desktop startup progress
Display a loading message while the Agent Zero Desktop environment is starting or restarting, so the right-canvas Desktop button gives immediate feedback before Xpra finishes waking up.
Remove the Collabora/WOPI runtime and route stack, including the old status APIs, proxy helpers, bootstrap extensions, and WOPI store tests. Add the Markdown-first document store, LibreOffice status/conversion helpers, LibreOfficeKit session bridge, and reusable Xpra virtual desktop gateway used by the new document runtime.
Update image and self-update bootstrap paths so existing containers can acquire the LibreOffice, XFCE, Xpra, and desktop-control dependencies through the normal install hooks instead of an ad hoc manual install.
